EdisonBright Fenix ALG-01 Picatinny/Weaver weapon rail mount with BBX3 battery carry case Precision Machined Aluminum with Anodized Black Matte Finish Mounting Base Designed with Locking Hex Screws to Fit on Picatinny/Weaver Rail Clever Adjustable Diameter Designed to Allow for Use with a Wide Range of Flashlights Universal Slide-on Flashlight Ring This bundle includes EdisonBright BBX3 battery carry case.